This year’s Pi Day is downright historical, so celebrate in style with these links

March 13, 2015 8:11 PM

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Tomorrow is Pi Day! And not just any Pi Day: Instead of the usual 3.14 to celebrate, we've got another two digits of the famous number. 3.14.15 is truly a once in a lifetime date for math nerds and dessert lovers.

If you're a little behind on your π appreciation, here's the 411. The number is the ratio of every circle's circumference (the length around) to its diameter (the length across the middle). Take any round thing in the world and divide the circumference by the diameter, and BAM, you've got π.

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